All the Way Down

A medium Python interview practice problem on DataDriven. Write and execute real python code with instant grading.

Domain

Python

Difficulty

medium

Seniority

L3

Problem

API responses arrive as dicts nested arbitrarily deep, and the warehouse needs them as single-level rows. Collapse `nested` into a flat dict whose keys are the full path down to each leaf, joined by `separator`, where any value that is not itself a dict is a leaf. An empty inner dict contributes no key, so that branch simply disappears from the result.

Summary

The payload nests without end. The warehouse needs one flat row.

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